Side Effects of Dihydrocodeine 30mg Specifically
This article focuses on the 30mg standard-release strength — the most commonly prescribed dose in the UK. For the full opioid-class breakdown see our general side effects guide.
What you’ll probably notice in the first week
- Constipation — almost universal. Start a stool softener day one.
- Drowsiness — peaks 1–3 hours after each dose. Don’t drive.
- Mild nausea — usually settles within 3–5 days; take with food.
- Dry mouth
What about chasing the dose?
At 30mg every 4–6 hours, most adults don’t notice any euphoria — just pain relief and mild drowsiness. If you find yourself wanting to take the next dose earlier and earlier, that’s a sign you should stop and reassess. Talk to a clinician about a taper.
30mg vs higher strengths — side-effect comparison
- 30mg: mild drowsiness, predictable
- 60mg SR: longer constipation, smoother peak/trough
- 120mg SR: full opioid side-effect burden, usually only used in tolerant patients
Managing the most common issues
- Constipation: lactulose 15ml twice daily, plus 2 litres of water and 30g fibre daily
- Nausea: take with food; cyclizine 50mg can help short-term
- Drowsiness: schedule doses around when you don’t need to drive; avoid alcohol
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